Hermosa Beach, CA has a population of 19,726 and is the 2,210th largest city in the United States. The population density is 13,828 per sq mi which is 5850% higher than the California average and 15162% higher than the national average. The median age in Hermosa Beach is 38 which is approximately 6% higher than the California average of 36. In Hermosa Beach, 48% of the population over 15 years of age are married, 90% speak English and 5% speak Spanish. 48% of Hermosa Beach residents were born in California, 41% were born out of state, 1% were born outside of the United States and 10% were foreign born.